Pioneer Cylinder Head Insert 5/8-11in Slotted Steel Zinc Oxide Set of 100

Pioneer EPC-52-100 freeze plug. Features 5/8in diameter, steel construction, zinc oxide finish, universal fit, prevents coolant leaks, sold as a set of 100.

Pioneer PF-580-4 thermactor plug. Features 5/8-11in thread, slotted head, steel construction, black oxide finish, fits Ford Cleveland/Modified, ensures secure sealing, sold as a set of 4.

Pioneer EPC-41-100 freeze plug. Features 1-5/8in diameter, steel construction, zinc oxide finish, universal fit, prevents coolant leaks, sold as a set of 100.

Pioneer EPC-16-100 freeze plug. Features 1in diameter, steel construction, zinc oxide finish, universal fit, prevents coolant leaks, sold as a set of 100.

Pioneer EPC-85-100 freeze plug. Features 1-1/2in diameter, steel construction, zinc oxide finish, universal fit, prevents coolant leaks, sold as a set of 100.